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Appl. Sci. 2017, 7(11), 1179;

Determination of the Constants of GTN Damage Model Using Experiment, Polynomial Regression and Kriging Methods

Mechanical Engineering Department, Bu-Ali Sina University, Hamedan 6517838695, Iran
Mechanical and Aerospace Engineering Department, Politecnico di Torino, Torino 10129, Italy
Mechanical Engineering Department, University of Texas at Arlington, Arlington, TX 76019, USA
Author to whom correspondence should be addressed.
Received: 8 October 2017 / Revised: 9 November 2017 / Accepted: 10 November 2017 / Published: 15 November 2017
(This article belongs to the Special Issue Soft Computing Techniques in Structural Engineering and Materials)
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Damage models, particularly the Gurson–Tvergaard–Needleman (GTN) model, are widely used in numerical simulation of material deformations. Each damage model has some constants which must be identified for each material. The direct identification methods are costly and time consuming. In the current work, a combination of experimental, numerical simulation and optimization were used to determine the constants. Quasi-static and dynamic tests were carried out on notched specimens. The experimental profiles of the specimens were used to determine the constants. The constants of GTN damage model were identified through the proposed method and using the results of quasi-static tests. Numerical simulation of the dynamic test was performed utilizing the constants obtained from quasi-static experiments. The results showed a high precision in predicting the specimen’s profile in the dynamic testing. The sensitivity analysis was performed on the constants of GTN model to validate the proposed method. Finally, the experiments were simulated using the Johnson–Cook (J–C) damage model and the results were compared to those obtained from GTN damage model. View Full-Text
Keywords: damage model; Gurson model; Kriging method; simulation; optimization damage model; Gurson model; Kriging method; simulation; optimization

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Rahimidehgolan, F.; Majzoobi, G.; Alinejad, F.; Fathi Sola, J. Determination of the Constants of GTN Damage Model Using Experiment, Polynomial Regression and Kriging Methods. Appl. Sci. 2017, 7, 1179.

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